Anyone selling non-slip slippers reasonably locally?

[Sue]

I urgently need some slippers. Wrong time of year I know.

I'm loath to buy any online as I've tried several times before and each time I've had to return them for some reason.

I need them to fit properly without slipping up at the back, be warm and - most importantly - be non slip.

Can anybody point me in the direction of a shop which may have any? (apart from the obvious local shoe shop). Thanks.